Safety tread



May 6 1924. 1,492,929 D. J. MURNANE SAFETY TREAD Filed S'eDt. 4. 1920 jgl.

Patented May 6, V1924.

UNITED STAT-Es Fica@ DANIEL J'. MURNANE, 0F CHICAGO HEIGHTS, ILLINOIS, ASSIGN'OR TO MARYfH.

MURNANE, 0F CHICAGO HEIGHTS, ILLINOIS..

SAFETY TREAD.

Application led September 4, 1920. Serial No'. 40S-,35.5.

To all whom. t may concern.'

Be it known that I, DANIEL J. MURNANE,

a citizen ofthe United States, residing at 2606 Chicago Road, Chicago Heights, in the county of Cook and State of Illinois, have inventedl a new and useful Improvement in Safety Treads, of which the following is a specification.

This invention relates to improvements in safety treads, or non-slipping treads adapted for use in general, and particularly desirable for use as treads for floors, mats, stairs, railway steps, elevator landings, and the like where there is excessive use and liability of slipping.

My improved safety tread presents a nonslipping surace in all weather condltlons, and may be submitted to excessive use and wear with very slight deterioration. It is so designed that it may be easily and cheaply made, and it may be readily installed.

In that form of device embodying the features of my invention, shown in the accompanying drawings, Figure 1 is a fragmentary top plan view of my improved tread with a part of the non-slipping material removed. Fi 2 is a vertical sectional view taken as in icated by the line 2 of Figure 1. Fig. 3 is a view in perspective of one end of one of the channels com rising a part of the tread. Fig. 4 is a top p an view of a modified form of tread. Fig. 5 is a vertical sectional view taken as indicatedby the line 5 of Fi 4. Fig. 6 is a perspective view of a modiffired form of tread.

My improved tread, as shown, comprises in general, a base plate 6 having mounted thereon, as more particularly explained hereinafter, a series of parallel arranged channels 7. As here Shown, there are two such channels 7 von the plate 6 lying adjacent each other. It is obvious, however, that without detracting from the spirit of this invention, -there may be any number of such channels 7 as desired, and they may be placed close together as shown in the drawings, 0r may be separated one from the other. Each of the channels 7 is formedof sheet metal, and has its longitudinal edges 8 upwardly and inwardly bent as shown in Fig. 2. Each of the channels is also provided with a series of holes 9 surrounded by an upwardly extending frusto conical circular fiange :10. The height of the flanges 10 is about one-half that. of the edges 8. It will be noted, that the formation of the holes 9 and flanges 10 in the sheet metal channels 7 will not be difficult, and will not require many operations. A. small hole may be formed by punching, and the ange 10 may be easily pressed up by means of a suitable die. It is possible, that by means of a suitable die, or proper machinery, the hole and flange may be formed in one operation.

lThe base plate 6 is also formed of sheet metal and is provided with holes l1 adapted to register with the holes 9 in the channels 7. Each of the holes 11 however, is about onehalf .of the size of the hole 9, and likewise provlded with an upwardly extending frusto conical ange 12 adapted to lie within the flange 10 and concentrically therewith. The holes 11 and anges 12 may be formed in the base plate 6 in a manner similar to the one in which the holes 9 and fianges 10 are formed in the channels 7. The fiange's 12 are slightly higher than the flanges 10, so that their upper edges will be on the same level when the channels 7 are resting on the base plate 6. s

In making the completed tread, the channels 7 are laid on the base plate 6 with the holes 9 and 11 registering as shown in Figure 1. The base plate 6 is placed on a flat surface in order t0 close the bottoms of the holes 11. Lead, 15, or other suitable nonslipping material is then poured into the channels 7, the ends of which have been temporarily blocked off to retain the lead therein. The lead will completely fill the channe1s7, and also the holes 9 and 11, as shown in Fig. 2, locking the channels 7 onto the base plate 6 by fiowing under and between the flanges 10 and 12. The upper surface of the lead 15 may then be smoothed off, if desired, in order to make it flush with the upper edges 8 of the channels 7 In Figs. 4 and 5, I have shown a modified form of the tread, especially adapted for laying in concrete; although it is obvious that this form also may be used in a' variety of ways. As here shown, the tread comprises an outer cylindrically shaped sheet metal shell 20, formed in afsimilar manner as the back end of a cartridge shell. The shell 20 is provided with the outwardly pro jecting flange 21, and has a hole 22 m the center with an upwardly extending frusto conical-circular flan e 23. Within the shell 20 is an inner shel 24 also cylindrical in shape, and provided with a hole 25 and a flange 26 similar to the flange 23, and arranged concentrically therewith. The arrangement of the flanges 23 and 26 is similar to the arrangement of the flanges 10 and 12 in the preferred form shown in Fi s. 1, 2, and 3. In the formation of the trea the outer shell 20 is placed on some flat material in order to close the bottom of the hole 22. The inner shell is then laced within the shell 20 as shown in the rawings, and lead 27, or other suitable non-slipping material is then poured into the inner shell 24 in order tofill the same' as show-n in Fig. A5. The lead 27 flowing under and between the flanges '23 and 26 will firmly lock the shell 24 in the shell 20. The lead 27 may then be leveled ofi', .ushed with the upper edge of the shell .24. The two shells thus locked toget-her, with the inner` one filled with lead, may then be fastened in place in any sultable manner. As shown in the drawings, the shells are laid in concrete 28, the flanges 21 serving to hold them in place. It will be noted that the space 3() between the shells 2O and 24 is left empty.

The modified form of tread shown in Fig. 6 comprises a base plate 50 upon which are mounted by means of the rivets 51 parallel channels 53 formed of sheet metal. Each of the channels 53 is provided with two parallel upwardly extendlng diverging flanges 54. The spaces between the channels 53 are filled with non-slipping material as indicated by 57.

While I have shown and described certain embodiments of my invention, it is to be understood that it is capable of many modifications. Changes therefore in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as possible in view of the prior art.

lVhat I claim as new and desire to secure by Letters Patents is:

`1. A tread surface, comprising a base plate with an upwardly extending locking member, a channel on the base plate with a hole in its bottom surface adapted to receive the locking member on the base late, said channel being provided with a loclling member adapted to coact with the first mentioned locking member, and non-slipping material within the channel and under and between said locking members.

Lacasse 2. In a tread surface, a base plete provided with an upwardly extending circular lockin flange, a channel member on the base plate aving its bottom surface provided with a hole adapted to receive the locking lange on the base plate, said hole being provided with a coacting locking flange, and non-slipping material within the channel and between and under the locking flanges. l 3. A tread surface, comprising a base plate provided with an upwardly extending frusto conical lookin flange, a channel on the base plate with a ole in its bottom sur- :face adapted to receive the locking flan 'e on the base plate, said hole provided wit an upwardl extending frusto conical coacting `locking ange, and non-slipping material in the channel and under and between the lock.-

ing flanges.

4. In a tread surface, a base plate provided with a hole havin an upwardly extending frusto conical loc ing flange, a channel on the base plate provided with a hole in its bottom surface adapted to receive the locking flange on the base plate, said hole being provided with a coacting rusto conical locking flange, and non-slipping material in the channel and under and between said locking flanges.

5. In a tread surface, a supporting plate provided with a locking flange, a receptacle mounted on the plate and provided with a coacting locking flange, and non-slip ing material in the receptacle and under an between the lookin' flanges.

6. A tread sur ace structure, comprising a base plate, a separate recess-forming member thereon, and a body of non-sli ping material located in'said recess, said base'plate, recess-formin member and body having portions at w ich said body and said plate and member interlock for securing said parts to ether.

A tread surface structure comprising a plate, independent separate members thereon having upwardly-extending walls forming channels, and non-sli ping material located, as to such part tlhereof as extends above the bases of said channels, wholly in said channels, said members extending side by side in contact with each other.

terial exposed at the upper surface of the nels, and non-slipping material in said chanstructure and located in said recess, said nels, said members extending side by side body and plate having portions which are in Contact with each other, substantially at 10 interlocked. the upper1 surface of said plate.

l0. A tread-surface structure com rising In testimony whereof, I havelhereunto set a plate, separate members thereon aving my hand. upwardly-extending walls forming chan- DANIEL J. MNANE. 

